Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
99 institutional managers reported holding MH for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 98%. 16 opened new positions; 13 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Platinum Equity Advisors, LLC/DE (focused) | 165.16M | 86.47% | $2.26B | unchanged | 2025 Q3 |
| T. Rowe Price Investment Management, INC. | 7.19M | 3.77% | $98.6M | added +56.6% | 2025 Q3 |
| American Century Companies INC | 4.18M | 2.19% | $57.3M | added +23.8% | 2025 Q3 |
| Vanguard Group | 2.72M | 1.43% | $37.3M | added +1.3% | 2025 Q3 |
| BlackBarn Capital Partners LP (focused) | 2.09M | 1.09% | $28.6M | added +49.2% | 2025 Q3 |
| BlackRock | 1.84M | 0.96% | $25.2M | trimmed -1.3% | 2025 Q3 |
| Alyeska Investment Group | 1.74M | 0.91% | $23.8M | unchanged | 2025 Q3 |
| Healthcare OF Ontario Pension Plan Trust Fund | 950.0k | 0.50% | $13.0M | unchanged | 2025 Q3 |
| Schroder Investment Management Group | 887.9k | 0.47% | $12.2M | trimmed -1.4% | 2025 Q4 |
| UBS | 739.3k | 0.39% | $10.1M | added +283.6% | 2025 Q3 |
| Geode Capital | 625.6k | 0.33% | $8.6M | added +3.1% | 2025 Q3 |
| State Street | 538.0k | 0.28% | $7.4M | added +16.6% | 2025 Q3 |
| Alberta Investment Management CORP | 476.0k | 0.25% | $6.5M | trimmed -44% | 2025 Q3 |
| Arrowstreet Capital | 469.5k | 0.25% | $6.4M | added +110.3% | 2025 Q3 |
| BNP Paribas Financial Markets | 449.7k | 0.23% | $6.2M | added +206.1% | 2025 Q3 |
| TD Asset Management INC | 424.9k | 0.22% | $5.8M | unchanged | 2025 Q3 |
| Bank OF America CORP /DE/ | 388.3k | 0.20% | $5.3M | added +178.4% | 2025 Q3 |
| Barclays PLC | 326.7k | 0.17% | $4.5M | added +2.9% | 2025 Q3 |
| Squarepoint Ops LLC | 301.6k | 0.16% | $4.1M | added +86.7% | 2025 Q3 |
| Seven Grand Managers, LLC | 300.0k | 0.16% | $4.1M | unchanged | 2025 Q3 |
| Peregrine Capital Management LLC | 299.1k | 0.16% | $4.1M | added +14.4% | 2025 Q3 |
| Ghisallo Capital Management LLC | 250.0k | 0.13% | $3.4M | unchanged | 2025 Q3 |
| Morgan Stanley | 248.4k | 0.13% | $3.4M | trimmed -19.5% | 2025 Q3 |
| Millennium Management | 214.2k | 0.11% | $2.9M | trimmed -51.6% | 2025 Q4 |
| Northern Trust | 212.0k | 0.11% | $2.9M | added +61.3% | 2025 Q3 |
| Citadel Advisors | 210.5k | 0.11% | $2.9M | added +60.6% | 2025 Q3 |
| Goldman Sachs | 210.2k | 0.11% | $2.9M | trimmed -18.8% | 2025 Q3 |
| Charles Schwab Investment Management | 210.1k | 0.11% | $2.9M | trimmed -2.9% | 2025 Q3 |
| SEI Investments CO | 185.1k | 0.10% | $2.5M | added +18.1% | 2025 Q3 |
| Renaissance Technologies | 169.1k | 0.09% | $2.3M | added +195.2% | 2025 Q4 |
| Voleon Capital Management LP | 164.9k | 0.09% | $2.3M | trimmed -8.4% | 2025 Q4 |
| Point72 | 158.2k | 0.08% | $2.2M | opened | 2026 Q1 |
| Balyasny Asset Management | 154.9k | 0.08% | $2.1M | added +56.1% | 2025 Q4 |
| LOS Angeles Capital Management LLC | 143.5k | 0.07% | $2.0M | added +40% | 2025 Q4 |
| Militia Capital Management LLC | 139.2k | 0.07% | $1.9M | opened | 2026 Q1 |
| Franklin Resources | 132.4k | 0.07% | $1.8M | trimmed -10.5% | 2025 Q3 |
| Two Sigma | 127.3k | 0.07% | $1.7M | trimmed -3.7% | 2025 Q3 |
| AQR Capital | 119.6k | 0.06% | $1.6M | trimmed -23.1% | 2025 Q4 |
| Longaeva Partners L.p. | 118.9k | 0.06% | $1.6M | trimmed -52.5% | 2025 Q4 |
| Walleye Capital LLC | 102.1k | 0.05% | $1.4M | added +515.7% | 2025 Q3 |
| Burkehill Global Management, LP | 100.0k | 0.05% | $1.4M | unchanged | 2025 Q3 |
| Marshall Wace | 90.8k | 0.05% | $1.2M | opened | 2025 Q3 |
| BNY Mellon | 70.4k | 0.04% | $965k | added +4.9% | 2025 Q3 |
| Deutsche Bank AG\ | 67.4k | 0.04% | $924k | added +258.5% | 2025 Q3 |
| Trexquant Investment LP | 65.3k | 0.03% | $896k | opened | 2026 Q1 |
| Algert Global LLC | 62.5k | 0.03% | $857k | opened | 2026 Q1 |
| Varcov CO. | 37.9k | 0.02% | $519k | trimmed -25.6% | 2025 Q4 |
| Nuveen | 34.1k | 0.02% | $467k | unchanged | 2025 Q3 |
| Federated Hermes, INC. | 32.9k | 0.02% | $451k | trimmed -72.1% | 2025 Q4 |
| Rhumbline Advisers | 32.7k | 0.02% | $448k | added +17.4% | 2025 Q3 |
Largest 50 of 99 shown; the full ranked, searchable register is at boothcheck.com/holders/MH. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.